Reports and Proceedings—Geological Society of London. 573 
is fully substantiated. The deposit between the top of the fossiliferous 
Grey Marls or ‘Sully Beds’ and the main Bone-bed at Blue Anchor 
measures 22 feet, and teems with interesting Rheetic fossils, such as 
Pteromya crowcombeia, Moore. The beds above the Bone-bed agree 
very well with those occupying the same stratigraphical position in 
Glamorgan, and include the ‘ Upper Rhetic’, the equivalent of the 
White Lias proper, and the ‘ Watchet Beds’. The now obscured 
magnificent sections, that were temporarily to be seen in the railway- 
cuttings at Langport and Charlton Mackrell, briefly noticed by 
Mr. H. B. Woodward, are described in detail (the records being made 
in company with Mr. E. T. Paris, F.C.S.). Here huge boulder-like 
masses of rock were noted at the top of the Black Shales, and the 
White Lias proper, with a well-marked Coral Bed, totalled 25 feet in 
thickness. ‘The classic sections of Snake Lane, Dunball (Puriton), 
Sparkford Hill (Queen Camel), Shepton Mallet, and Milton (Wells), 
have been re-investigated and brought into line; and the interesting 
thin Rheetic deposits in Vallis Vale, at Upper Vobster, and sections in © 
the Radstock district, and on the Nempnett and neighbouring outliers, 
are described. In addition to the record of many new or imperfectly 
known sections, this investigation has also shown that the MWicrolestes 
Marls are equivalent to the Sully Beds: that the Wedmore Stone 
occurs well below the Bone-bed; that Moore’s ‘ Flinty Bed’ at Beer 
Crowecombe is probably on the horizon of the Plewrophorus Bed 
(No. 18); that the Upper Rheetic (generally with Cotham Marble or 
its equivalent) is as persistent as usual, if not quite so thick; that 
the White Lias proper is of restricted geographical extent; and that 
on the Bristol Channel littoral are marls, ‘ Watchet Beds,’ above the 
White Lias. Around Queen Camel, Moore’s ‘ Insect and Crustacean 
Beds’ appear to come in at an horizon which lies between the Watchet 
Beds and the Ostrea Limestone. 
The following classification of the Rheetic Series is suggested, and 
the succession of maxima of the characteristic fossils is given in the 
paper :— 
Thicknesses in 
Lras. HErTANGIAN. Ostrea Beds, etc. England. 
( I. Watchet Beds (‘ Marly Beds ) : 
{ of the White lias’) 0 #0. 7 #4. Zan. 
SOMERSETIAN He es Jade (Wie a7 \ 0 to 25 ft. 
RuztTIc + [a Westbury Beds (‘ Upper \ 2 ft. Vin. to 19 ft 
Rheetic ’) APG ; ; 
| ( IV. Lilstock Beds (Black Shales) 1 to (?) 47 ft. 
| RH=TIAN V. Sully Beds (Fossiliferous 
l | Grey Marls) | 0 to 144. 
oan { ee { Perera ane Grey Marls . . 111 ft. (max.). 
The sudden lithic and faunal changes in the contiguous divisions 
are held to be the expression of oscillatory movements and interrupted 
sequential deposition. The fauna of the Rhetian is decidedly Swabian 
in facies, and the general conclusion to be derived from the study of 
the beds is in entire agreement with Suess’s view, that while the 
dominant movement was one of subsidence and not local but extended, 
it was, nevertheless, ‘‘ oscillatory and slow.” 
